Something is wrong with T0N signals.

TDC08[48] is T0N, TDC13[48:57] are T0N[0:9]

tt->Draw("TDC08[48]:TDC13[48]>>h2","","colz")

tt->Draw("TDC08[48]:TDC13[49]>>h2","","colz")

tt->Draw("TDC08[48]:TDC13[50]>>h2","","colz")

tt->Draw("TDC08[48]:TDC13[51]>>h2","","colz")

tt->Draw("TDC08[48]:TDC13[52]>>h2","","colz")

tt->Draw("TDC08[48]:TDC13[53]>>h2","","colz")

tt->Draw("TDC08[48]:TDC13[54]>>h2","","colz")

tt->Draw("TDC08[48]:TDC13[55]>>h2","","colz")

tt->Draw("TDC08[48]:TDC13[56]>>h2","","colz")

tt->Draw("TDC08[48]:TDC13[57]>>h2","","colz")